Properties
| Category | Cyclosilicate |
|---|---|
| Formula | Be3Al2(SiO3)6 |
| Crystal system | Hexagonal |
| Color | Green, blue, yellow, colorless, pink, and others |
| Crystal habit | Prismatic to tabular crystals; radial, columnar; granular to compact massive |
| Cleavage | Imperfect on {0001} |
| Fracture | Conchoidal to irregular |
| Tenacity | Brittle |
| Mohs scale hardness | 7.5–8.0 |
| Luster | Vitreous to resinous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.63–2.92 |
From the Wikipedia article
Beryl ( BERR-əl) is a mineral composed of beryllium aluminium silicate with the chemical formula Be3Al2(SiO3)6. Well-known varieties of beryl include emerald and aquamarine. Naturally occurring hexagonal crystals of beryl can be up to several meters in size, but terminated crystals are relatively rare. Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, pink, and red (the rarest). It is an ore source of beryllium.
Source
Source record: crystal-compendium/heliodor/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Beryl — revision id 1376827981. Text and properties from Wikipedia, licensed CC BY-SA 4.0.